Calculate and plot real and reactive power matlab

  • #1
672
0

Homework Statement


Write a Matlab function to compute and plot real and reactive power consumed (or
supplied) by a known impedance (the value of complex impedance should be used as the function’s input) as a function of either current or voltage (use a character: V or I as a second input) for a predefined range of 0-200 V or 0-10 A. Your function must report the impedance value in the plot title. Both, real and reactive powers should be plotted on the same axes. Verify functionality of your module for 300+j100 Ω and 100-j100 Ω impedances. Plot the power both
vs. voltage and current (total of four separate graphs).



Homework Equations





The Attempt at a Solution


function[Real,Reactive]=Compute_Power_Real_Reactive(impedance,V)


I=V/abs(impedance);
theta=atan(imag(impedance)/real(impedance));

P=V*I*cos(theta);
Q=V*I*sin(theta);

disp(P);
disp(Q);
end

This is my code so far this is what I get:

>> Compute_Power_Real_Reactive(300+100i,1:50:200)
??? Error using ==> mtimes
Inner matrix dimensions must agree.

Error in ==> Compute_Power_Real_Reactive at 7
P=V*I*cos(theta);

I cannot figure out why this doesn't work
 

Answers and Replies

  • #2
donpacino
Gold Member
1,439
283
in matlab everything is matrix based. so if you do A/B, that is matrix division of A and B.

if you do A./B, that is element by element division of A and B.

so short answer, your code should look like this

P=V.*I*cos(theta);
Q=V.*I*sin(theta);
 
  • #3
672
0
Thanks I figured out what I was doing wrong turns out I was right on some of it but needs quite a bit more code to do
 

Related Threads on Calculate and plot real and reactive power matlab

  • Last Post
Replies
5
Views
16K
Replies
3
Views
2K
Replies
7
Views
2K
  • Last Post
Replies
5
Views
5K
Replies
1
Views
1K
Replies
3
Views
960
Replies
2
Views
2K
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
0
Views
3K
Top